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(No Model.)

0, G. PERKINS.

INUANDESGENT LAMP. No. 326,584, Patented Sept. 22 1885.

A S INVENTUH:

N. PETERS. Photo-Lilho m her, wmhmgun. D. c.

NTT D STATES Fries.

PATENT CHARLES G. PERKINS, OF NEW YORK, N. Y., ASSIGNOR TO THE IMPERIALELECTRIC LIGHT COMPANY, OF SAME PLACE.

-|NCANDESCENT LAMP.

SPECIFICATION forming part of Letters Patent No. 326,584, datedSeptember 22, 1885.

Application filed September 7, 1883.

T all whom it may concern.-

Be it known that I, CHARLES G. PERKINS, a citizen of the United States,and a resident of New York, in the county of New York and State of NewYork, have invented certain new and useful Improvements in ElectricIncandescent Lamps, of which the following is a specification.

My invention relates to improvements in multiplefilament incandescentlamps; and it consists, chiefly, in a novel arrangement ot'the filamentsin the lamp, whereby during the incandescence of the filaments the lightofall the series will be concentrated and appear likea solid glow. Thisproperty ofmy lamp adapts it especially for use in connection withparabolic reflectors, as on railway-engines and in lighthouses. I findit, however, to be asuperior lamp for ordinary use, the apparent sourceof light being large and not affecting the retina, when looked at, withthe keenly-unpleasant sensation which is produced when the source is thethin line of a single filament.

In the drawings which illustrate my inven- 2 tion, Figure 1 is anelevation of an incandescent lamp having four filaments arranged inaccordance with my invention, and Fig. 2 is a plan of the filaments, thethickness thereof being exaggerated for the sake of clearness, 0 and thelamp-globe being shown in section.

A is the globe of the lamp,within which the carbons b c d e are arrangedin two pairs, as shown. The filaments 0 e, constituting one pair, areshown as parallel with each other 5 and at right angles to the filamentsb d of the other pair. This arrangement is not necessary, as the anglebetween the pairs may vary in the case of a larger number of filamentscon siderably from a right angle, and the filaments of each pair not beabsolutely parallel, but

only substantially so.

(No model.)

In case flat filaments are employed, the filaments of each pair arearranged to leave their flat faces parallel, and in arranging a largernumber of filaments than four three or more filaments would be similarlyarranged in one or more of the groups.

The filament b is represented in the drawings as extending undere andover a. In like manner 0 extends over d and (I over 6. This arrangementis likewise not essential, it being only necessary that the filamentsshould be grouped near each other,and so arranged that the plane of eachfilament will cut that of one of the opposite pairs at or nearitsinside. 5 5

.Having noW described my invention, what I claim, and desire to secureby Letters Patent, 1s

1. The combination, in an electric incandescent lamp,ofi'our loopedfilaments arranged in two pairs, the filaments of each pair being inplanes substantially parallel to each other, and substantially at rightangles to the planes of the other pair, substantially as described.

2. The combination, in an electric incandescent lamp, of agroup of fiatlooped filaments, every one of which is arranged to have its flat facesubstantially parallel with one or more of the others, and substantiallyat right angles to two or more of the others,whereby two or more broadlight-giving surfaces will be presented on every side of the lamp, andthe carbons during incandescence will seem to give out light from asolid center, substantially as described. 7 5

Signed at New York, in the county of New- York and State of New York,this 6th day of September, A. D. 1883.

CHARLES G. PERKINS.

\Vitnesses:

J. A. HURDLE, JOHN A. ELLIs.

